<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8" />
  <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <meta name="theme-color" content="#000000" />
  <meta name="description" content="Web site created using create-react-app" />
  <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
  <!--
      manifest.json provides metadata used when your web app is installed on a
      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
    -->
  <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
  <!--
      Notice the use of %PUBLIC_URL% in the tags above.
      It will be replaced with the URL of the `public` folder during the build.
      Only files inside the `public` folder can be referenced from the HTML.

      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
      work correctly both with client-side routing and a non-root public URL.
      Learn how to configure a non-root public URL by running `npm run build`.
    -->
  <title>严选</title>
  <script>
    /**
    * JS版本
    * 以750为基础做适配，1rem = 100px, 1rem = 100rpx;
    * 监听pc端的resize事件和mobile的横屏（orientationchange）事件
    */
    var fun = function (doc, win) {
      var docEl = doc.documentElement,//基于根元素html,rem相对于html的fontSize
        resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
        //resizeEvt 适应屏幕宽度变化 orientationchange横屏事件，resize事件
        recalc = function () {
          var clientWidth = docEl.clientWidth;
          if (!clientWidth) return;

          //这里是假设在750px宽度设计稿的情况下，1rem = 100px；
          //可以根据实际需要修改
          docEl.style.fontSize = (clientWidth / 750) * 100 + 'px';
        };
      if (!doc.addEventListener) return;
      win.addEventListener(resizeEvt, recalc, false);
      doc.addEventListener('DOMContentLoaded', recalc, false);
      // ie 绑定事件是通过 attachEvent和detachEvent 绑定事件
    }
    fun(document, window);

    /**
     * CSS版本
     */
    // html{
    //     font-size: calc(100vw / 750 * 100);
    // vw c3单位老型浏览器不认识vw，（比如：ie） 屏幕宽度100% calc是 
    // }
    // #多倍
  </script>
</head>

<body>
  <noscript>You need to enable JavaScript to run this app.</noscript>
  <div id="root"></div>
  <!--
      This HTML file is a template.
      If you open it directly in the browser, you will see an empty page.

      You can add webfonts, meta tags, or analytics to this file.
      The build step will place the bundled scripts into the <body> tag.

      To begin the development, run `npm start` or `yarn start`.
      To create a production bundle, use `npm run build` or `yarn build`.
    -->
</body>

</html>